The teenager, who lost her mother Whitney just last month, is rumoured to be engaged to 22-year-old Nick Gordon the boy Whitney raised from the age of 12 when his father was sent to prison and his mother was unable to care for him.
Whitney often referred to Nick as her son, but since the singer's death the press has unearthed a clandestine relationship between Bobbi Kristina and the boy she still refers to as her "brother".
The pair were photographed kissing recently and now Star magazine is reporting that they're secretly engaged.
"Nick proposed to Krissy on March 10, and she said yes," a source told the mag. "Krissy said Nick is the only person she trusts in the world. They have a very deep connection."
But Bobbi Kristina's grandmother Whitney's mother Cissy has refused to give the young lovers her blessing.
"What they're doing is incestuous," the outraged 78-year-old told TMZ.
Gross pashfest alert! More "incestuous" celebs in our slideshow of Inappropriate celebrity kisses.
Brother on sister, father on son, Paris Hilton on Chihuahua ... These celebrities don't just need to get a room, they need to get a shrink!